From d4f3c16c4a3a7a63067b24d08822227afd778627 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 30 Aug 2024 14:52:46 -0700
Subject: [PATCH] Hide the UnsafeCell content of opaque C++ types in regard to
 unwind safety

---
 src/opaque.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/opaque.rs b/src/opaque.rs
index bd4827858..8a495b329 100644
--- a/src/opaque.rs
+++ b/src/opaque.rs
@@ -4,6 +4,7 @@ use crate::void;
 use core::cell::UnsafeCell;
 use core::marker::{PhantomData, PhantomPinned};
 use core::mem;
+use core::panic::RefUnwindSafe;
 
 // . size = 0
 // . align = 1
@@ -19,6 +20,8 @@ pub struct Opaque {
     _mutable: SyncUnsafeCell<PhantomData<()>>,
 }
 
+impl RefUnwindSafe for Opaque {}
+
 // TODO: https://github.com/rust-lang/rust/issues/95439
 #[repr(transparent)]
 struct SyncUnsafeCell<T>(UnsafeCell<T>);